mitt romney and barack obama will be live from denver. it is serious business, but there are also two games being played here. there's the expectations game the two campaigns have been playing. then there's the game of dodge ball. that's what we're talking about this morning. joining me now live is todd rogers. he's an assistant professor at harvard's kennedy school. thank you very much for joining us. >> hi, gary. thanks for having me. >> the artful dodge. what is that all about? >> so with a collaborator here at harvard, we've been doing psychological experiments to understand how its they politicians manage to evade questions without being detected so we've run a series of these experiments where viewers are randomly assigned to one of three conditions. in one condition they watch a video where a moderator asks a question that say as what will you do about the universal health care problem in the world. the politician said, i'll glad you asked me that. we need universal health care. we then splice out the question, have the moderator a